To write NEET exam you should be turning 17 years on December 31st of the year of taking admission. The next rule is you should complete your 12th in Physics, Chemistry and Biology. Third rule is students who are writing their 12th exams this year can also participate in NEET. If you are in 11th, you have to wait for one more year to write NEET. You cant fill the application form this year. You can only write NEET if you are studying 12th or you have completed your 12th. If you are in your 11th, work hard to score atleast 50% in  Physics, Chemistry and Biology. 50% for UR and for OBC,SC,ST it is 40%.